US4616691A - Countergravity casting apparatus - Google Patents

Countergravity casting apparatus Download PDF

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Publication number
US4616691A
US4616691A US06/806,618 US80661885A US4616691A US 4616691 A US4616691 A US 4616691A US 80661885 A US80661885 A US 80661885A US 4616691 A US4616691 A US 4616691A
Authority
US
United States
Prior art keywords
mold
metal
upper shell
pot
vacuum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/806,618
Other languages
English (en)
Inventor
Karl D. Voss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motors Liquidation Co filed Critical Motors Liquidation Co
Priority to US06/806,618 priority Critical patent/US4616691A/en
Assigned to GENERAL MOTORS CORPORATION, A CORP OF DELAWARE reassignment GENERAL MOTORS CORPORATION, A CORP OF DELAWARE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: VOSS, KARL D.
Priority to CA000515951A priority patent/CA1262504A/fr
Application granted granted Critical
Publication of US4616691A publication Critical patent/US4616691A/en
Priority to EP86308551A priority patent/EP0226315B1/fr
Priority to DE8686308551T priority patent/DE3663894D1/de
Priority to BR8606038A priority patent/BR8606038A/pt
Priority to JP61291691A priority patent/JPS62137166A/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould

Definitions

  • This invention relates to apparatus for the vacuum countergravity casting of metal in gas-permeable, shell molds and, more particularly, to means for sealing a mold to a vacuum chamber.
  • the vacuum countergravity, shell mold casting process is particularly useful in the making of thin-walled castings and involves: sealing a bottom-gated mold, having a gas-permeable upper portion, to the mouth of a vacuum chamber such that the chamber confronts the upper portion; immersing the underside of the mold in an underlying melt; and evacuating the chamber to draw melt up into the mold through one or more of the gates in the underside thereof.
  • a process is shown in U.S. Pat. No. 4,340,108 wherein the mold comprises a resin-bonded-sand shell having an upper cope portion and a lower drag portion sealingly bonded together.
  • the invention comprehends an improved vacuum countergravity casting apparatus including: a mold having a porous, gas-permeable upper shell and a bottom-gated lower portion secured to the upper shell; a sealing surface atop the mold which is substantially insulated conduction-wise, from the heat of the metal in the underlying melt pot; a vacuum box comprising a peripheral wall defining a vacuum chamber having a lip on the underside thereof defining the chamber's mouth; an elastomeric gasket compressed between the underside of the lip and the sealing surface of the mold; and a skirt depending from the wall beneath the lip so as to surround the gasket and the sealing surface sufficiently to shield the gasket from heat radiating from the pot.
  • the sealing surface on the mold may be formed on top of the upper shell.
  • the lower portion of the mold will include a continuous upstanding ridge lying outboard the upper shell and adjacent the periphery of the mold, which ridge has the mold's sealing surface formed on the top thereof.
  • the thickness of the mold-forming material (e.g., resin-bonded-sand) between the gasket and the melt serves to insulate the surface, conduction-wise, from the pot's heat.
  • FIG. 1 is a side, sectioned view (i.e., in direction 1--1 of FIG. 2) through a vacuum countergravity metal casting apparatus in accordance with the present invention
  • FIG. 2 is a view in the direction 2--2 of FIG. 1;
  • FIG. 3 is a view in the direction 3--3 of FIG. 2.
  • FIG. 1 shows a pot 2 of metal melt 4 which is to be drawn up into the mold 6.
  • the mold 6 includes gas-permeable, upper portions 8 and 8' joined (e.g., glued) to a lower portion 10 along parting lines 12 and 12' and define therebetween separate molding cavities 16 and 16'.
  • the lower portion 10 includes a plurality of ingates 14 on the underside thereof for supplying melt to the mold cavities 16 and 16' when the cavities are evacuated.
  • the lower portion 10 of the mold 6 is sealed to the mouth 18 of a vacuum chamber 20, which is defined by vacuum box 22, such that the gas-permeable upper portions 8 and 8', are encompassed by the chamber 20.
  • the vacuum chamber 20 is communicated to a vacuum source (not shown) via conduit 23.
  • the upper portions 8 and 8' of the mold 6 comprise a gas-permeable material (e.g., resin-bonded-sand) which permits gases to be withdrawn from the casting cavities 16 and 16' when a vacuum is drawn in the chamber 20.
  • the lower portion 10 of the mold 6 may conveniently comprise the same material as the upper portions 8 and 8' , or other materials, permeable or impermeable, which are compatible with the upper portion material.
  • pieces of angle iron 26 are welded to the inside of the walls 24 of the box 22 so as to provide a continuous, inwardly projecting shelf or lip defining the mouth 18 of the vacuum chamber 20.
  • a continuous, elastomeric gasket 28 e.g., silicone or fluoroelastomer rubber
  • the gasket 28 may be a simple O-ring, but will preferably have a rectangular cross-section for more effective sealing.
  • the mold 6 will include a sealing surface on an upper surface thereof for engaging the underside of the gasket 28.
  • This surface may be formed anywhere on the upper portion of a mold so long as a continuous surface can be provided.
  • the lower portion 10 of the mold 6 will include a continuous upstanding ridge 30 having an upper sealing surface 32 for engaging the elastomeric gasket 28 and compressing it against the shelf 26 when the mold 6 is secured to the vacuum box 22.
  • the upstanding ridge 30 on the bottom mold portion 10 lies outboard the porous upper shell portions 8 and 8' so that the upper portions 8 and 8', as well as the parting lines 12 and 12' , will confront the vacuum chamber 20 for the reasons set forth in U.S. Ser. No. 654,404.
  • the mold 6 may be secured to the chamber 20 by means of inverted cups 34 which have self-tapping, female threads 35 on the inside surface thereof which are screwed onto upstanding mounting lugs 36 in the manner described in copending U.S. patent application Ser. No. 806,619, filed concurrently herewith in the name of Karl Voss and assigned to the assignee of the present invention.
  • the walls 24 of vacuum box 22 extend below the angle iron lip 26 of the vacuum chamber 20 so as to form a depending skirt portion 38 thereof.
  • the skirt 38 depends sufficiently beneath the vacuum chamber 20 to surround the gasket 28 and at least the uppermost portion of the ridge 30 to shield the elastomeric gasket 28 from the radiant heat of the melt 4 in the pot 2 during casting.
  • the lower edge 40 of the skirt 38 will engage a shoulder 42 on the bottom portion 10 of the mold 6 and serves as a stop means for locating the mold 6 in the vacuum chamber 20.
  • the edge 40 abuts the shoulder 42 and prevents overcompression of the gasket 28 and generally insures consistent positioning of each mold in the vacuum box 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US06/806,618 1985-12-09 1985-12-09 Countergravity casting apparatus Expired - Fee Related US4616691A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US06/806,618 US4616691A (en) 1985-12-09 1985-12-09 Countergravity casting apparatus
CA000515951A CA1262504A (fr) 1985-12-09 1986-08-14 Appareil de coulee par contre-gravite
EP86308551A EP0226315B1 (fr) 1985-12-09 1986-11-03 Appareil pour la coulée contre la gravité
DE8686308551T DE3663894D1 (en) 1985-12-09 1986-11-03 Countergravity casting apparatus
BR8606038A BR8606038A (pt) 1985-12-09 1986-12-08 Aparelho para fundicao a vacuo em contragravidade de metal em fusao
JP61291691A JPS62137166A (ja) 1985-12-09 1986-12-09 反重力式鋳造装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/806,618 US4616691A (en) 1985-12-09 1985-12-09 Countergravity casting apparatus

Publications (1)

Publication Number Publication Date
US4616691A true US4616691A (en) 1986-10-14

Family

ID=25194448

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/806,618 Expired - Fee Related US4616691A (en) 1985-12-09 1985-12-09 Countergravity casting apparatus

Country Status (6)

Country Link
US (1) US4616691A (fr)
EP (1) EP0226315B1 (fr)
JP (1) JPS62137166A (fr)
BR (1) BR8606038A (fr)
CA (1) CA1262504A (fr)
DE (1) DE3663894D1 (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225004A2 (fr) * 1985-11-27 1987-06-10 General Motors Corporation Moule de fonderie pour la coulée à dépression
EP0226321A2 (fr) * 1985-12-09 1987-06-24 General Motors Corporation Appareil pour la coulée contre la gravité
US4745962A (en) * 1987-07-27 1988-05-24 General Motors Corporation Countergravity casting apparatus
US4809767A (en) * 1988-06-24 1989-03-07 General Motors Corporation Countergravity casting apparatus
EP0325864A2 (fr) * 1988-01-25 1989-08-02 General Motors Corporation Appareil de coulée contre-gravité
US4858672A (en) * 1988-05-25 1989-08-22 General Motors Corporation Countergravity casting apparatus and method
US4862946A (en) * 1988-11-23 1989-09-05 General Motors Corporation Vacuum countergravity casting apparatus and method
US4901781A (en) * 1988-08-30 1990-02-20 General Motors Corporation Method of casting a metal matrix composite
US4957153A (en) * 1989-05-02 1990-09-18 General Motors Corporation Countergravity casting apparatus and method
US4971131A (en) * 1989-08-28 1990-11-20 General Motors Corporation Countergravity casting using particulate filled vacuum chambers
US4977948A (en) * 1988-07-15 1990-12-18 General Motors Corporation Countergravity casting apparatus and method using elastomeric sealing gasket and cooled vacuum chamber
US5035277A (en) * 1991-01-25 1991-07-30 General Motors Corporation Counter gravity casting apparatus
US5062467A (en) * 1991-05-10 1991-11-05 General Motors Corporation Vacuum countergravity casting apparatus and method
US5062466A (en) * 1991-05-10 1991-11-05 General Motors Corporation Countergravity casting apparatus and method
US20070035066A1 (en) * 2005-02-22 2007-02-15 Gervasi Vito R Casting process
US8030082B2 (en) 2006-01-13 2011-10-04 Honeywell International Inc. Liquid-particle analysis of metal materials
US9114418B2 (en) 2010-12-29 2015-08-25 Android Industries Llc Working tank with vacuum assist

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4828011A (en) * 1988-06-24 1989-05-09 General Motors Corporation Countergravity casting apparatus
CN110976814B (zh) * 2019-11-25 2021-07-06 哈尔滨工业大学 一种铝合金汽车架的半连续反重力浇注方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2997756A (en) * 1956-07-17 1961-08-29 Griffin Wheel Co Method and apparatus for casting ingots
DE1433413A1 (de) * 1962-04-18 1968-11-07 Friedrich Krupp Ag Abstich-Entgasungspfannen-Dichtung
US4340108A (en) * 1979-09-12 1982-07-20 Hitchiner Manufacturing Co., Inc. Method of casting metal in sand mold using reduced pressure
US4508157A (en) * 1983-04-15 1985-04-02 Hitchiner Manufacturing Co., Inc. Self-tapping support for shell molds

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5914306A (ja) * 1982-07-14 1984-01-25 日新電機株式会社 密閉形開閉装置
JPS59147768A (ja) * 1983-02-15 1984-08-24 Hitachi Metals Ltd 鋳造方法
JPS59153565A (ja) * 1983-02-18 1984-09-01 Hitachi Metals Ltd 減圧鋳造用鋳型とその取付方法
JPS603959A (ja) * 1983-06-20 1985-01-10 Ube Ind Ltd 鋳造方法
US4641703A (en) * 1985-11-27 1987-02-10 General Motors Corporation Countergravity casting mold and core assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2997756A (en) * 1956-07-17 1961-08-29 Griffin Wheel Co Method and apparatus for casting ingots
DE1433413A1 (de) * 1962-04-18 1968-11-07 Friedrich Krupp Ag Abstich-Entgasungspfannen-Dichtung
US4340108A (en) * 1979-09-12 1982-07-20 Hitchiner Manufacturing Co., Inc. Method of casting metal in sand mold using reduced pressure
US4508157A (en) * 1983-04-15 1985-04-02 Hitchiner Manufacturing Co., Inc. Self-tapping support for shell molds

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225004A3 (fr) * 1985-11-27 1988-06-01 General Motors Corporation Moule de fonderie pour la coulée à dépression
EP0225004A2 (fr) * 1985-11-27 1987-06-10 General Motors Corporation Moule de fonderie pour la coulée à dépression
EP0226321A2 (fr) * 1985-12-09 1987-06-24 General Motors Corporation Appareil pour la coulée contre la gravité
EP0226321A3 (en) * 1985-12-09 1987-12-09 General Motors Corporation Countergravity casting apparatus
US4745962A (en) * 1987-07-27 1988-05-24 General Motors Corporation Countergravity casting apparatus
EP0301693A2 (fr) * 1987-07-27 1989-02-01 General Motors Corporation Dispositif pour la coulée à dépression
EP0301693A3 (en) * 1987-07-27 1989-07-12 General Motors Corporation Countergravity casting apparatus
US4932461A (en) * 1988-01-25 1990-06-12 General Motors Corporation Countergravity casting apparatus
EP0325864A2 (fr) * 1988-01-25 1989-08-02 General Motors Corporation Appareil de coulée contre-gravité
EP0325864A3 (en) * 1988-01-25 1990-08-01 General Motors Corporation Countergravity casting apparatus
US4858672A (en) * 1988-05-25 1989-08-22 General Motors Corporation Countergravity casting apparatus and method
US4809767A (en) * 1988-06-24 1989-03-07 General Motors Corporation Countergravity casting apparatus
US4977948A (en) * 1988-07-15 1990-12-18 General Motors Corporation Countergravity casting apparatus and method using elastomeric sealing gasket and cooled vacuum chamber
US4901781A (en) * 1988-08-30 1990-02-20 General Motors Corporation Method of casting a metal matrix composite
US4862946A (en) * 1988-11-23 1989-09-05 General Motors Corporation Vacuum countergravity casting apparatus and method
US4957153A (en) * 1989-05-02 1990-09-18 General Motors Corporation Countergravity casting apparatus and method
EP0415091A3 (en) * 1989-08-28 1992-06-10 General Motors Corporation Countergravity casting using particulate filled vacuum chambers
EP0415091A2 (fr) * 1989-08-28 1991-03-06 General Motors Corporation Coulée de contre-gravité utilisant des chambres sous vides remplies séparément
US4971131A (en) * 1989-08-28 1990-11-20 General Motors Corporation Countergravity casting using particulate filled vacuum chambers
US5035277A (en) * 1991-01-25 1991-07-30 General Motors Corporation Counter gravity casting apparatus
US5062467A (en) * 1991-05-10 1991-11-05 General Motors Corporation Vacuum countergravity casting apparatus and method
US5062466A (en) * 1991-05-10 1991-11-05 General Motors Corporation Countergravity casting apparatus and method
US20070035066A1 (en) * 2005-02-22 2007-02-15 Gervasi Vito R Casting process
US8312913B2 (en) 2005-02-22 2012-11-20 Milwaukee School Of Engineering Casting process
US8030082B2 (en) 2006-01-13 2011-10-04 Honeywell International Inc. Liquid-particle analysis of metal materials
US9114418B2 (en) 2010-12-29 2015-08-25 Android Industries Llc Working tank with vacuum assist

Also Published As

Publication number Publication date
BR8606038A (pt) 1987-09-15
JPS62137166A (ja) 1987-06-20
CA1262504A (fr) 1989-10-31
EP0226315A2 (fr) 1987-06-24
JPH0249823B2 (fr) 1990-10-31
EP0226315A3 (en) 1987-10-07
EP0226315B1 (fr) 1989-06-14
DE3663894D1 (en) 1989-07-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: GENERAL MOTORS CORPORATION, DETROIT, MICHIGAN, A C

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VOSS, KARL D.;REEL/FRAME:004509/0515

Effective date: 19851125

CC Certificate of correction
FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19941019

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362